Sound-regenerating device



June 1929. P, G, ANDRES l l,716,475

SOUND REGENERATING DEVI CE Filed DeG. 18, 1926 Patented `lune 11", 1929.

UNITED STATES PATENTI OFFICE.

PAUL G. ANDRES, 0F ST. CHARLES, ILLINOISVASSIGNOR, 'BY MESNE ASSIGNMENTS,

TO UNITED REPRODUCERS CORPORATION, OF ST. CHARLES, ILLINOIS, .AV CORPORA- TION 0F NEW JERSEY.

SOUND-REGENERATING DEVICE.

Application filed December 18, 1926. Serial No. 155,602.

The presentI invent-ionrelates to devices for effecting soundreproductions.

Among the objects of the invention is to provide a novel sound regenerating device or a device, such as an electro-magnetic device, adapted for the conversion of energies, as mechanical energy to electrical' or electromagnetic energy or vice versa, for the reproduction of sound. This novel invention is adapted for use in connection with telephone receivers, radio loud speaker horns or cones or other like and similar diaphragmatic sound emitting and amplifying means, pick-up devices for talking machines or pho'nographs, and the'like. mechanical vibrations derived from the undulations of a phonograph record may be transmitted to an armature of an electro2 magnetic device acting as a generator for effecting variations in the circuit thereof in consonance or concordance with the initiatory vibrations or original productions, so that such variations, whether amplified or not, may be effective in a receiver'of the telephone or loud speaker type for repro-duction of sound. In the other cases, the audio frequency electrical '01| electro-magnetic energy from a radio receiving device or on the receiving end of a telephone line, may be converted through the electro-magnetic device, acting as a motor, into mechanical vibrations and energies for actuating a diaphragmatic sound emitting means. The invention comprehends the transmission of the energies at the locus of conversion in a different direction than heretofore with a component relativemovement and with a change of the moment of force to the end of augmenting the actuating force whereby those frequencies which are not at the fundamental points of the device, may be strengthened and raised from the valleys toward the peaks of the fundamental frequencies or harmonics there of. In this way the whole audible range of frequencies may be made substantially uniform in amplitudey and volume.

The invention, in a yspecific embodiment thereof, attains such by the disposing of the vibratory elements, such as the actuating connection between the armature of the electromagnetic and a diaphragmatic sound emitting means, and an armature connected there- .to at an acute angle to each other. This angle may be determined for obtaining the best cie- In the ease of the latter the or diaphragm, particularly at those frey quencies which are not fundamental to the device and which, owing to the load or inertia tending to dampen such frequencies, such that the greater force so applied will give the sound emitting surface the' full and desired amplitudes and hence a more uniform volume of sound reproduction. At the fundamental frequency points, the load orpinegrtia of the device will not dampen such frequencies, since the device operates freely with the desired volume at such points.

Another object of the invention is to provide a unitary assembly, such as the coils, armature and pole pieces or shoes, adapted for-ready attaching or securement to or detachment from a permanent magnetpref erably at the poles thereof, and to so dispose the assembly with` the parts thereof atan angle, preferably an acute angle, to the plane of the permanent magnet. This affords for connecting the actuating means or element, such as the actuating rod or wire, so that it may extend laterally from the device, as referred to the magnet, yet be connected to the armature at an acute angle thereto so that the rod or wire may receive the desired increased forces or stresses at the non-fundamental points of the -frequencies reproduced. Ina specific embodiment of the invention, the assembly is preferably carried upon a mounting securable to the magnet and holding the coils,

shoes and armature at tlie'desired angle to theplane of the magnet.

The invention also comprehends, as a part thereof, the idea of means for supporting the armature in vibratory position relative to the coils and polar shoes or pieces, and be adapted;

to yield to such movements 'of ,the armature but to restore it to normal or central or medial position. In a specific embodiment, such re- -when the armature is vibrated, yet readily restore the armature to its original and normal position.' By so restoring the armature, the latter will not be carried to an pole and adhere thereto, but may be mai tained in balanced or neutral position relative'thereto. The invention comprehends other features, advantages, capabilities and objects as will later appear and are inherently possessed by the invention. Referring to the drawing, Fig. 1 is a View in elevation of a device constructed in acunitary'assembly.

cordance with the invention.

Fig. 2 is a vertical sectional View taken-in a plane represented by line 2-2 in Fig. 1 of the drawings.

Fig. 3 is atop plan view or end View of the Fig. 4 is a transverse sectional view taken in a plane represented by line 4-4 in Fig. 2 of thedrawings.

And, Fig. 5 is'a transverse sectional view taken' in an inclined plane represented by line 5-5 in Fig. 2 of the drawings.

Referring now' more in det-ail to the drawing the embodiment selected to illustrate the invention is shown as included in an electromagnetic device comprising a permanent magnet 1 having spaced poles 2 and 3 to which "above description that the pole pieces or shoes may be secured an assembly of electromagnetic members. Such assembly comprises a mounting having a transverse non-magnetic plate 4 apertured at the ends thereof for the passage of securing screws 5 and 6 threaded into flanges 7 and 8 of supporting plates 9 and 10' extending into theJ space between thepoles 2 and 3 and in engagement with the inner surfaces thereof, as clearly shown in Figs. The supporting` 3 and 4 of the drawings. members 9 and 10, together with their flanges 7 and 8 are preferably of non-magnetic material. lt will be apparent from the .above that the poles 2 and 3 of the permanent magnet occupy the spaces between the screws 5 and 6 and the supporting plates 9 and 10, and that the whole assembly may be held securely inplace by a suitable tightening of the'screws 5 and'6.

To the inner surfaces of the supporting plates 9 and 10 are located magnetic pole pieces or shoes 11 and 12 and 13 and 1 4 which are preferably U-shaped with a leg 15 or 16 or 17 or 18 respectively of these pieces, in contact with the inner faces of the plates 9 and 10 and with the other legs 19-or 20er 21 or 22 spaced therefrom and located in the space beplates 91 and 10 and threaded into holding plates 23 and 24, as clearly shown in Fig. 5 of the drawings.

Surrounding the legs 19, 20, 21 and 22 are solenoids or electrical coils 26, 27, 28 and 29, these coils engaging thelegs with sufiicient friction to be held properly in place as shown upon the drawings. ably connected in series in an .electrical circuit with the terminals passing to binding posts 30 and 31 mounted upon the cross member 4. Spacing rods or bars 32, 33 andv 34 may be secured at their ends to the supporting plates 9'and 10 in order to hold the same in proper spaced relation and to form a rigid Within the space between the ends of the legs 19, 20, 21 and 22 and also between the coils, is mounted an armature 35 which may be provided with aneXtension 36 secured into an aperture or slot in a torsion rod or restoring element 37 having its ends 38 and 39 anchored in the side supporting plates 9 and 10, as clearly shown in Figs. 3 and 4 of the drawings. At theA other side of the armature 35 may be provided an extension 40 to which is lsecured an end of an actuating rod or wire L 41, which may be suitably threaded to receive securing elements (not shown) for holding a These coils are prefer` cone or other diaphragmatic sound emitting means.

lt willbe noted from the drawing and 11, 12, 13 and 14, as also the coils 26, 27, 28 and 29, and the armature 35,- are disposed at an mature may oe-transmitted with a component movement to the rod 41 and in a direction along the axis thereof. ln this way a greater force may be delivered along. the rod and the means to be actuated thereby, with the elfect of strengthening the particular vibrations or frequencies which are not at the fundamental points of the device, so that they may be raised in amplitude so as to be substantially the same as the frequencies at the fundamental points. As the armature vibrates, the portion of the rod 37 connected to it will have .a sufficient amount of yield or resiliency so as to permit such armature to properly vibrate, but yet quickly restore the armature to its central or normal position and hold it there toV prevent the armature from being drawn into contact with any of the legs, 19 or 20 or 21 or 22of the polar pieces.

While the invention has been shown in an embodiment for converting electric-or electrical energy into mechanical energy for vibrating a cone or diaphragm, it is to be understood that the invention is also applicable to a pick-up device on a phonoi graph or the like for converting mechanical energy to electrical or electro-magnetic energy. In the latter case, the rod 41 may be in the form of a stylus which may operate in a groove of arecord, having hill and dale undulations. In the event of using a record with grooves having lateral un- -dulations, the stylus would be disposed at right angles to the present position of the rod 41, but be at an acute angle to the armature 35. In the case of a pick-up device, the mechanical vibrations received or derived from the phonograph record Will be transmitted to the armature 35 which will set up variations in tlie circuitof the electrical coils or solenoids and the circuit thereof which may be connected to a receiving electro-magnetic device or a loud speaker horn or cone or even a telephone receiver of a telephone line, or of head pieces, and if desired, the

same may be amplified by passing the current through a suitable radio-audio amplifying device.

`While I have herein described and upon the drawings shown an illustrative embodime of the invention, it is to be understood that the invention is not limited thereto but may comprehend other constructions, details and arrangements of parts Without departring from the spirit thereof.

thearmature may vibrate, and an actuating 4 means connected to said armature and disposed to transmit an actuating force in a direction at an acute angle to the plane of the armature.

2. In a sound regenerating device, an elec-- tro-magnetic means having a vibratory armature associatedtherewith, a torsion rod connected to an end of said armature, and an actuate a diaphgramatic sound emitting' means.

3. 4In a sound regenerating device, an electro-magnetic means having a vibratory armature associated therewith, a torsion restoring means connected to said armature and adapted to yield to vibratory movements of the armature and to restore the armature to normal centralposition, and an actuating means connected to said armature and so arranged to transmit an actuating force in a direction at an .acute angle to the plane of n'said armature.V

4. An electromagnetic device adapted for conversion of energies for the reproduction of sound, comprising a permanent magnet having polar pieces, coils, cores associated with said pieces, an armature'vibratably supported to cooperate with said cores, said disposed at an acute angle to the plane of said magnet, a/nd an actuating means associated with said armature for transmission of vibrations to or from the same.

6. An electro-magnetic device adapted for conversion of energies for the reproduction of sound, comprising a permanent magnet having polar pieces, coils, said pieces, having poles associated with said permanent magnet and poles acting as cores for said coils, an armature vihratably associated wit the latter puoles, said pieces, coils and armature being disposed at an acute angleto the plane of said'magnet, andan actuating element connected to said armature at an acute angle 7 An electro-magnetic device adapted for conversion of energies for the'reproduction of sound, comprising a permanent magnet having polar pieces, coils, said pieces having poles associated with saidpermanent magnet and poles acting as cores for said coils, an armature vibratably associated With the latter poles, said pieces, coils and armature being disposed at an acute angle to the plane of said magnet, a restoring means carriedby `said magnet and connected to said armature .and adapted to yield', to vibrations of said armature and' to restore the same to normal centralposition, and an actuating means associated with said armature for transmission of vibrations to or from the same.

8. An electro-magnetic device adapted for conversion of energies for the' reproduction of sound, .comprising apei'manent magnet having poles, a unitary assembly detachably asociated with said magnet at the poles thereof and comprising polar shoes, coils as sociated with said shoes, an` armature vibratably associated Withsaid coils and shoes,

and an actuating means associated with said armature for transmission vof vibrations to or from the saine.

- 9. An electro-magneticdevice adapted for conversion of energies for .thef' reproduction of sound, comprising a permanent magnet having poles, a unitary 4assembly detachably associated with said magnet'at the poles thereof and comprising polar shoes, coils associated with said shoes, an armature vibratably associated with said coils'and shoes, y said assembly being disposed with said shoes,

coils and armature at an acute angle to the plane ot' said magnet., and an actuating means associated with said armature for transmission of vibrations to or from the same.

10. An electro-magnetic device adapted for.

conversion o'l energies for the reproduction of sound, comprising a permanent magnet having poles, a unitary assembly detachably associated with said magnet at the poles thereof and comprising polar shoes, coils associated with said shoes, an arn'iature vibratably associated with said coils and shoes, said assembly being disposed with said shoes, coils and armature at an acute angle to the plane of said magnet, and an actuating element connected to said armature at an acute angle thereto.

11. An electro-magnetic device adapted for conversion ol' energies for the reproduction of sound, comprising a permanent magnet having poles, a unitary assembly detachably associated with said i magnet at the poles thereof and comprising polar shoes, coils associated With said shoes, an armature vibratably associated With said coils and shoes, said assembly being disposed with said shoes, coils and armature at an acute angle to the| plane of said magnet, a restoringmember carried by said assembly and connected to :of sound, comprising a permanent magnet said armature, said member being yieldable to vibratory movements of said armature and capable of restoring the armature to normal or mean'position relative to said coils and shoes, and an actuating means associated with said armaturefor transmission of vibrations to or from the same. l

12. An electro-magnetic device adapted Yfor conversionof energies for the reproduction of sound, comprising a permanent magnet havg ing poles, a unitary assembly detachably associated With said magnet at the poles thereof and comprising `polar shoes, coils associated with said shoes, an armature vibratably associated with said coils and shoes, said assembly being disposed with said shoes, coils and armature at an acute` angle to the plane of said magnet, a torsion member comprised in said assembly-and being connected to an end of said armature, said member being adapted to yield to vibratory movements of said armature and capable of restoring the armature to normal medial position relahaving poles, a mounting adapted for securement to said poles and haring means for holding polar shoes in given relation to said poles, coils carried by said shoes, and an armature on said supporting means and vibratably located between said coils and shoes, and an actuating means associated with said armature for transmission of vibrations to or from the same.

14. An electro-magnetic device adapted for conversion otenergies for the reproduction ot' sound, comprising a permanent magnet having poles, a mount-ing adapted for securement to said poles and having means for holding polar shoes at an acute angle to the planel of said magnet, coils carriedby said shoes, and an armature on said supporting means and vibratably located between said coils and shoes, said coils and armature being disposed at an acute angle to the plane of said magnet'.J vand an actuating means associated with said armature for transmission of vibrations to or from the same.

15. An electro-magnetic device adapted for conversion of energies for the reproduction of sound, comprising a permanent magnet having poles, a mounting adapted for securement to said poles and having means for holding polar shoes at an acute angle to the plane of said magnet, coils carried by said shoes, and an armature on said supporting means and vibratably located between said. coils and shoes, arestoring member carried by said supporting means and connected to said armature, said member being capable yof yielding to vibratory movements of said armature and to restore said armature to normal central position relative to said coils and shoes, said coils and armature being disposed at an acute angle to the plane of said magnet, and an actuating means associated With said armature for transmission of vibrations to or from the same. i

In Witness whereof, I hereunto subscribemy name to this specification.

PAUL G. ANDRES. 

